Twin directories of Teach:

[DIR]  ftp://ftp.kc.ru/pub/FreeBSD/Teach/
[DIR]  ftp://ftp.kc.ru/pub/Linux/Teach/
[DIR]  ftp://ftp.math.ethz.ch/hg/EMIS/mirror/IMU/Logo/tmp/torus.math.uiuc.edu/jms/Teach/
[DIR]  ftp://ftp.gwdg.de/pub/EMIS/mirror/IMU/Logo/tmp/torus.math.uiuc.edu/jms/Teach/
[DIR]  ftp://ftp.ics.muni.cz/pub/EMIS/mirror/IMU/Logo/tmp/torus.math.uiuc.edu/jms/Teach/
[DIR]  ftp://ftp.km.ru/v01/Soft/Teach/